Asynchronous Downlink Massive MIMO Networks: A Stochastic Geometry Approach
Journal article, 2020

Massive multiple-input multiple-output (M-MIMO) is recognized as a promising technology for the next generation of wireless networks because of its potential to increase the spectral efficiency. In initial studies of M-MIMO, the system has been considered to be perfectly synchronized throughout the entire cells. However, perfect synchronization may be hard to attain in practice. Therefore, we study a M-MIMO system whose cells are not synchronous to each other, while transmissions in a cell are still synchronous. We analyze an asynchronous downlink M-MIMO system in terms of the coverage probability and the ergodic rate by means of the stochastic geometry tool. For comparison, we also obtain results for the corresponding synchronous system. In addition, we investigate the effect of the uplink power control and the number of pilot symbols on the downlink ergodic rate, and we observe that there is an optimal value for the number of pilot symbols maximizing the downlink ergodic rate of a cell. Our results also indicate that, compared to the synchronous system, the downlink ergodic rate is more sensitive to the uplink power control in the asynchronous mode.


Massive MIMO

synchronous and asynchronous systems

stochastic geometry


Elaheh Sadeghabadi

Queen's University

Sharif University of Technology

Seyed Mohammad Azimi-Abarghouyi

Sharif University of Technology

Behrooz Makki


Chalmers, Electrical Engineering, Communication and Antenna Systems, Communication Systems

Masoumeh Nasiri-Kenari

Sharif University of Technology

Tommy Svensson

Chalmers, Electrical Engineering, Communication and Antenna Systems, Communication Systems

IEEE Transactions on Wireless Communications

1536-1276 (ISSN)

Vol. 19 1 579-594 8874998

Subject Categories


Communication Systems

Other Electrical Engineering, Electronic Engineering, Information Engineering



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1/5/2021 1